I'm just trying to get more credit for doing little. Lol.
The ZR1 FPCM is going to be the core of a very interesting project for me...
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2010 Camaro LS3 (E38 ECU - Spark only). MS3X running complete RTT fuel control (wideband).
Whipple 2.9L, 3.875" Pulley, kit injectors, supplied MSD Boost-A-Pump, stock pump
LG Motorsports 1 7/8" Headers - No Cats, stock mid pipe with JBA Axle Back
ZL1 Wheels/Tires
You're not going to get very far past the limits of the internal regulator without some massive pump to overcome it.
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Just say no to bull s***.
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1961 C-10 5.3 NV3500
2007 NNBS ECSB 4.8
Stock I actually started decreasing desired fuel pressure at 3000rpm.
Here's the changes to the injector and pump duty cycle with 400kpa/58psi across the board
Stock FPCM Settings
rpm------Fuel psi/desired-------Inj DC-------Pump DC
5000-----48/50-------------------60----------81.6
6000-----46/48-------------------73----------91.4
400kpa Fuel Pressure flat across
5000-----57/58-------------------54----------85.9
6000-----61/58-------------------60-------- 95.0
Last edited by 10_SS; 04-03-2017 at 08:25 PM.
2010 Camaro LS3 (E38 ECU - Spark only). MS3X running complete RTT fuel control (wideband).
Whipple 2.9L, 3.875" Pulley, kit injectors, supplied MSD Boost-A-Pump, stock pump
LG Motorsports 1 7/8" Headers - No Cats, stock mid pipe with JBA Axle Back
ZL1 Wheels/Tires
DSX Tuning - Authorized HP Tuners Dealer
http://www.dsxtuning.com
http://www.facebook.com/dsx.tuning
Just say no to bull s***.
IF YOU WANT HELP, POST A FILE!
2010 Camaro LS3 (E38 ECU - Spark only). MS3X running complete RTT fuel control (wideband).
Whipple 2.9L, 3.875" Pulley, kit injectors, supplied MSD Boost-A-Pump, stock pump
LG Motorsports 1 7/8" Headers - No Cats, stock mid pipe with JBA Axle Back
ZL1 Wheels/Tires
I thought about blocking it off also for Camaro, but doesn't the siphon tube rely on recirc from the regulator? I was thinking that is why they leave 50% DC on the pump at idle? Then I was thinking I could just remove the regulator and put a restrictor in it, but then that would lose some flow at WOT since it would always be losing fuel...
2010 Camaro LS3 (E38 ECU - Spark only). MS3X running complete RTT fuel control (wideband).
Whipple 2.9L, 3.875" Pulley, kit injectors, supplied MSD Boost-A-Pump, stock pump
LG Motorsports 1 7/8" Headers - No Cats, stock mid pipe with JBA Axle Back
ZL1 Wheels/Tires
The regulator is just to prevent some insane over pressure scenario. They run 50% duty cycle around idle to be able to maintain the lower pressure at lower flow.
It's interesting that HPT added scanning parameters for the FPCM. I had asked about this before, but was told support was done for FPCMs for now. I couldn't figure out the CAN response, but admittedly didn't spend much time on it either. I just checked OSID 20964291, and nothing is supported for the FPCM for scanning.
DSX Tuning - Authorized HP Tuners Dealer
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http://www.facebook.com/dsx.tuning
Just say no to bull s***.
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I agree, I didn't notice these PID's in scanner before.
Regarding the regulator... my tune shows 68psi setpoint, with about 50% DC on idle and normal driving. So I think the regulator is bypassing fuel all the time, just like a recirc system except it's recircing directly inside the tank. This keeps the pump cool and creates the siphon needed to suck fuel from the other side of the tank. Removing or plugging the regulator will dead head the pump, could overheat it, and stop the siphoning affect and possibly run the pump side of the tank out of fuel with fuel left in the other side.
That's what I got from looking at the regulator at least.. it has the siphon part built into it.
Last edited by 10_SS; 03-29-2017 at 09:08 AM.
2010 Camaro LS3 (E38 ECU - Spark only). MS3X running complete RTT fuel control (wideband).
Whipple 2.9L, 3.875" Pulley, kit injectors, supplied MSD Boost-A-Pump, stock pump
LG Motorsports 1 7/8" Headers - No Cats, stock mid pipe with JBA Axle Back
ZL1 Wheels/Tires
Dave, no disrespect, but I've put 13 zl1 vin in many as fpcm of various years with no issues using sps/tis and an mdi.
2010 Camaro LS3 (E38 ECU - Spark only). MS3X running complete RTT fuel control (wideband).
Whipple 2.9L, 3.875" Pulley, kit injectors, supplied MSD Boost-A-Pump, stock pump
LG Motorsports 1 7/8" Headers - No Cats, stock mid pipe with JBA Axle Back
ZL1 Wheels/Tires
I can say that I personally have a pile of FSCMs dead due to mismatched OS writes.
So what is the preferred method at this point, for say a 2010 Camaro SS equipped with the ZL1 intank pump assembly, make changes to the stock SS FPCM to reflect ZL1 settings,or install a stock ZL1 FPCM?
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Well at this point sound like I'm the only one that's made changes and have proof it responds, Im also one of the few that are still runnign a stock SS pump with a supercharger. I changed the Max Desired Pressure table values that drop below 400kpa, to 400kpa since I have a 58psi (400kpa) regulator (stock SS) and it now holds 58psi to at least 5000rpm. Before it would start dropping at 3000rpm, so that table works. Then I noticed there are allot of other tables in the ECU side that also show 400kpa, so some of those might need to be increased if you plan to go above 58psi with ZL1 pump.
Log Desired Fuel Pressure and Fuel pressure and see what it does all the way to redline WOT, then change that table to not go below 400kpa and try it again. Should see a big difference if you still have the stock SS FPCM.
2010 Camaro LS3 (E38 ECU - Spark only). MS3X running complete RTT fuel control (wideband).
Whipple 2.9L, 3.875" Pulley, kit injectors, supplied MSD Boost-A-Pump, stock pump
LG Motorsports 1 7/8" Headers - No Cats, stock mid pipe with JBA Axle Back
ZL1 Wheels/Tires